diff options
Diffstat (limited to 'drivers/misc/max8893.c')
| -rw-r--r-- | drivers/misc/max8893.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/misc/max8893.c b/drivers/misc/max8893.c new file mode 100644 index 0000000..9a3836a --- /dev/null +++ b/drivers/misc/max8893.c @@ -0,0 +1,160 @@ +/* +* +*Minimalistic MAX8893 PMIC driver for CMC732 WiMAX chipset +* +*Use retrys when bus is shared or problematic. +* +*Functions not exported are made static +* +*In this driver, BUCK is referred as LDO number "-1" +*/ + + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/gpio.h> +#include <linux/delay.h> +#include <linux/wimax/samsung/max8893.h> + +/*#define WIMAX_DEBUG*/ + + +static struct i2c_client *max8893_client; + + + +static int max8893_set_ldo(int ldo, int enable) +{ + int temp; + temp = i2c_smbus_read_byte_data(max8893_client, MAX8893_REG_ONOFF); + if (temp < 0) + return temp; + temp = enable ? (temp|ENABLE_LDO(ldo)) : (temp&DISABLE_LDO(ldo)); + return i2c_smbus_write_byte_data(max8893_client, + MAX8893_REG_ONOFF, (unsigned char)temp); + +} + +#ifdef WIMAX_DEBUG + +static int max8893_get_ldo(int ldo) +{ + int temp; + temp = i2c_smbus_read_byte_data(max8893_client, MAX8893_REG_ONOFF); + if (temp < 0) + return temp; + return (temp&ENABLE_LDO(ldo)) ? 1 : 0; +} + +static int max8893_get_voltage(int ldo) +{ + int voltage; + voltage = i2c_smbus_read_byte_data(max8893_client, + MAX8893_REG_LDO(ldo)); + return voltage ; + +} + +#endif + +static int max8893_set_voltage(int ldo, int mv) +{ + int temp; + if (mv > MAX_VOLTAGE(ldo)) + return -22; + temp = MIN_VOLTAGE(ldo); + if (mv < temp) + return -22; + temp = (mv - temp)/100; + return i2c_smbus_write_byte_data(max8893_client, + MAX8893_REG_LDO(ldo), (unsigned char)temp); +} + +int wimax_pmic_set_voltage(void) +{ + int ret; +#ifdef WIMAX_DEBUG + int i; +#endif + + mdelay(10); + ret = ( + max8893_set_voltage(BUCK, 1200)| + max8893_set_voltage(LDO1, 2800)| + max8893_set_voltage(LDO2, 2800)| + max8893_set_voltage(LDO3, 3300)| + max8893_set_voltage(LDO4, 2900)| + max8893_set_voltage(LDO5, 2800) + ); + if (ret) + printk(KERN_ERR "ERROR SETTING WIMAX PMIC POWER ret = %d\n", + ret); + +#ifdef WIMAX_DEBUG + max8893_set_ldo(BUCK, ON); + max8893_set_ldo(LDO1, ON); + max8893_set_ldo(LDO2, ON); + max8893_set_ldo(LDO3, ON); + max8893_set_ldo(LDO4, ON); + max8893_set_ldo(LDO5, ON); + + for (i = 1; i < 6; i++) { + printk(KERN_DEBUG "[WIMAX_DEBUG] LDO%d STATE :%d\n", i, + max8893_get_ldo(i)); + printk(KERN_DEBUG "[WIMAX_DEBUG] LDO%d VOLTAGE:%x\n", i, + max8893_get_voltage(i)); + } +#endif + return ret; +} +EXPORT_SYMBOL(wimax_pmic_set_voltage); + +static int max8893_wmx_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; +#ifdef WIMAX_DEBUG + int i; +#endif + max8893_client = client; + return 0; +} + + +static int max8893_wmx_remove(struct i2c_client *client) +{ + max8893_set_ldo(BUCK, OFF); + max8893_set_ldo(LDO1, OFF); + max8893_set_ldo(LDO2, OFF); + max8893_set_ldo(LDO3, OFF); + max8893_set_ldo(LDO4, OFF); + max8893_set_ldo(LDO5, OFF); + return 0; +} +const struct i2c_device_id max8893_wmx_id[] = { + { "max8893_wmx", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, max8893_wmx_id); +static struct i2c_driver max8893_wmx_driver = { + .probe = max8893_wmx_probe, + .remove = max8893_wmx_remove, + .id_table = max8893_wmx_id, + .driver = { + .name = "max8893_wmx", + }, +}; +static int __init max8893_wmx_pmic_init(void) +{ + return i2c_add_driver(&max8893_wmx_driver); +} +static void __exit max8893_wmx_pmic_exit(void) +{ + i2c_del_driver(&max8893_wmx_driver); +} +subsys_initcall(max8893_wmx_pmic_init); +module_exit(max8893_wmx_pmic_exit); +MODULE_DESCRIPTION("MAXIM 8893 PMIC driver for WiMAX"); +MODULE_AUTHOR("SAMSUNG ELECTRONICS"); +MODULE_LICENSE("GPL"); |